package com.atguigu.flink.chapter07.state;

import com.atguigu.flink.bean.WaterSensor;
import org.apache.flink.api.common.state.ReducingState;
import org.apache.flink.api.common.state.ReducingStateDescriptor;
import org.apache.flink.configuration.Configuration;
import org.apache.flink.streaming.api.environment.StreamExecutionEnvironment;
import org.apache.flink.streaming.api.functions.KeyedProcessFunction;
import org.apache.flink.util.Collector;

/**
 * @Author lizhenchao@atguigu.cn
 * @Date 2021/9/18 15:34
 */
public class Flink06_State_Keyed_Reduce {
    public static void main(String[] args) throws Exception {
        StreamExecutionEnvironment env = StreamExecutionEnvironment
            .getExecutionEnvironment()
            .setParallelism(3);
        env
            .socketTextStream("hadoop162", 9999)
            .map(value -> {
                String[] datas = value.split(",");
                return new WaterSensor(datas[0], Long.valueOf(datas[1]), Integer.valueOf(datas[2]));
                
            })
            .keyBy(WaterSensor::getId)
            .process(new KeyedProcessFunction<String, WaterSensor, String>() {
    
                private ReducingState<Integer> sumVcState;
    
                @Override
                public void open(Configuration parameters) throws Exception {
                    sumVcState = getRuntimeContext()
                        .getReducingState(
                            new ReducingStateDescriptor<Integer>("sumVcState",
                                                                 Integer::sum,
                                                                 Integer.class)
                        );
                }
                
                @Override
                public void processElement(WaterSensor value,
                                           Context ctx,
                                           Collector<String> out) throws Exception {
                    sumVcState.add(value.getVc());
    
                    out.collect(ctx.getCurrentKey() + " 水位和: " + sumVcState.get());
                    
                }
            })
            .print();
        
        env.execute();
        
    }
}
